Congress is considering legislation that would make tech platforms responsible for any spread of child sex imagery on their websites. In the past, federal laws, known as Section 230, protected platforms like Google and Facebook from liability in such situations. The new bill, nicknamed the “Earn It Act” would require the tech industry to take serious steps to fight child sexual exploitation on the web or lose their legal protections. At the same time, the Justice Department is preparing to announce 11 “voluntary principles” outlining a campaign to combat online child predators. Representatives of the tech industry created the principles.